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Pages: 238, Paperback, Independently published
DeGraw Publishing
Ultimate Variety Sudoku Challenge Extreme Level: 500 Variant Puzzles The Logic Expert...
Independently Published
Gray Matter Vol29: Unyielding Sudoku: 200 Extreme Sudoku Puzzles for Adults: The...
Anti Diagonal Sudoku Extreme 400 Very Hard Logic Puzzles for Experts: Ultimate Brain Challenge
Hard Shell Sudoku Vol7: Ironclad Grids: The Ultimate Challenge in Books for Adults
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